DECmau 900TL Installation

This document is an installation and operational guide for the DECmau 900TL, a Token Ring Multistation Access Unit (MAU) from Digital's Token Ring product family.

Key information covered includes:

1. Product Description: The DECmau 900TL connects up to eight stations to a Token Ring network, operating at 4 or 16 Mb/s with automatic speed detection. It uses 100-ohm shielded/unshielded cable with RJ45 connectors or 150-ohm IBM Type 1 data cable with a transformer. It can be managed by optional HUBwatch software.
2. Installation: It provides detailed steps for installing the MAU into a DEChub 900 MultiSwitch (including removal of an existing single-slot hub if necessary) and setting up a standalone DEChub ONE MAU 900TL (including optional mounting, setting autowrap switches, and connecting power). In both cases, instructions for connecting station cables are provided.
3. Front and Rear Panels: Descriptions of all LEDs (Power, Module OK, Ring A/B, Speed, Lobe, Ring In/Out), connectors, and switches, explaining their functions and what their states indicate.
4. LED Summary & Troubleshooting: A comprehensive table explaining the meaning of various LED states (on, off, flashing, scrolling) for diagnosing common network issues, guiding users to identify problems such as power loss, self-test failures, network activity, station access issues, and speed mismatches.
5. Cabling Guidelines: Detailed information on maximum lobe lengths for shielded (STP) and unshielded twisted-pair (UTP) cables at different speeds, including considerations for multiple MAUs and wiring closets. It also provides specifications for connector pin signals.
6. Product Specifications: Technical data on the MAU's size, weight, environmental conditions (temperature, humidity, altitude), power requirements, connectors, and agency certifications.

The document serves as a complete guide for installing, configuring, and basic troubleshooting of the DECmau 900TL.